There are two ways to manage your spend with Criteo:
Campaign spend limits
Campaign spend limits are applied for all ad sets associated with the campaign. All ad sets under this spend limit will be paused once their collective spend hits the amount specified.
Spend limits do not enforce any pacing or spend allocation among ad sets.
You will not be billed for any spend above the amount specified by the spend limit within the renewal period.
Ad set budgets
Ad set budgets determine the target spend limit or pacing that you wish to achieve with an ad set. This can be used to specify more granular spending strategies among ad sets in your campaign.
Ad set delivery will stop when this amount is reached.